CD271 is a functional and targetable marker of tumor-initiating cells in head and neck squamous cell carcinoma

Oncotarget. 2014 Aug 30;5(16):6854-66. doi: 10.18632/oncotarget.2269.

Abstract

Tumor-initiating cells (TICs) in squamous cell carcinoma of the head and neck (SCCHN) are best characterized by their surface expression of CD44. Although there is great interest in identifying strategies to target this population, no marker of these cells has been found to be functionally active. Here, we examined the expression of the purported marker of normal human oral epithelial stem cells, CD271. We show that CD271 expression is restricted to a subset of the CD44+ cells. Using xenograft assays, we show that the CD44+CD271+ subpopulation contains the most tumorigenic cells. Loss of CD271 function results in a block in the G2-M phase of the cell cycle and a profound negative impact on the capacity of these cells to initiate tumor formation in vivo. Incubation with recombinant NGF results in enhanced phosphorylation of Erk, providing additional evidence that CD271 is functionally active. Finally, incubation of SCCHN cells with antibody to CD271 results in decreased Erk phosphorylation and decreased tumor formation in vivo. Thus, our data are the first to demonstrate that CD271 more specifically identifies the TIC subpopulation within the CD44+ compartment in SCCHN and that this receptor is a functionally active and targetable molecule.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antigens, Neoplasm / biosynthesis*
  • Antigens, Neoplasm / immunology
  • Carcinoma, Squamous Cell / immunology
  • Carcinoma, Squamous Cell / metabolism*
  • Carcinoma, Squamous Cell / pathology
  • Cell Growth Processes / physiology
  • Cell Line, Tumor
  • Female
  • Head and Neck Neoplasms / immunology
  • Head and Neck Neoplasms / metabolism*
  • Head and Neck Neoplasms / pathology
  • Heterografts
  • Humans
  • Hyaluronan Receptors / biosynthesis
  • Hyaluronan Receptors / immunology
  • Mice
  • Mice, Inbred BALB C
  • Neoplastic Stem Cells / immunology
  • Neoplastic Stem Cells / metabolism*
  • Neoplastic Stem Cells / pathology
  • Nerve Tissue Proteins / biosynthesis*
  • Nerve Tissue Proteins / immunology
  • Phosphorylation
  • Receptors, Nerve Growth Factor / biosynthesis*
  • Receptors, Nerve Growth Factor / immunology
  • Squamous Cell Carcinoma of Head and Neck
  • Xenograft Model Antitumor Assays

Substances

  • Antigens, Neoplasm
  • Hyaluronan Receptors
  • NGFR protein, human
  • Nerve Tissue Proteins
  • Receptors, Nerve Growth Factor